Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2440739 A
Publication typeGrant
Publication dateMay 4, 1948
Filing dateApr 25, 1945
Priority dateApr 25, 1945
Publication numberUS 2440739 A, US 2440739A, US-A-2440739, US2440739 A, US2440739A
InventorsLeo J Conroy
Original AssigneeLeo J Conroy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lead screw coupling
US 2440739 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Patented May 4, i948 LEAD SCREW :olilLrriGy` Y l Leo Conroy, Waterloo, N. Y.

Application-April 25, 1945, seriaiNo. 590,187

The present invention relates to new andluseful improvements in couplingsof atype adapted for connecting lead screwsA to vworkhead spindles of threading lmachines and for various other purposes where an easily-manipulated coupling is desired for connecting male and female parts to each other. g

i An importantobject of the present invention is to provide a coupling of this character possessing certain definite advantages not possessed by other types of couplings and including the provision of a tapered seat in the spindle or female part in which a tapered stem on the male part, or lead screw, is seated and drawn in tight frictonal engagement by the nut without excessive strain on the nut, such tapering construction and the nut providing a tight joint between the parts and further providing an interlocking connection between the male and female parts to eliminate play at the joint thereof.

A further object of the invention is to provide a device of this character of simple and practical construction, which is ecient and reliable in operation, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a longitudinal sectional view of the coupling.

Figure 2 is a transverse sectional view taken substantially on a line 2-'2 of Figure 1, and

Figure 3 is a detail of the locking plug for the ball bearings forming part of the coupling and with parts shown in section.

Referring now to the drawing in detail, wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention, the numeral 5 designates a work head driving spindle which constitutes the female part of the coupling, the spindle being formed with a tapering bore 8.

'Ihe lead screw is designated at 1 and which forms the male part of the coupling, the inner end of the lead screw being formed with a. tapering stem 8 conformably received in the tapering bore 6 of the spindle.

The lead screw 1 is formed with a threaded portion 9 at the inner end of the stem 8 adapted for threaded engagement with the internally threaded portion I0 in one end of the bore II of a 2 Claims. (o1. 287-1055 couplingnut 'IZQmounted for free rotation on the outer end' of" the spindle 5.

The outer surface of the spindle 5 is provided with spaced circumferential grooves lIII and the 1 bore II ofthe nut I2 is formed `with a groove I3 adapted for selectively registering with grooves I4 and for receiving aplurality of ball bearings I5.

The ball bearings are inserted in the grooves through a lateral passage I6 in the nut I2 the passage being closed after the insertion of the ball bearings by means of a plug I 'I having a threaded head threaded in a countersink of the passage I6, the plug including a stem I8 having a recess or radius I 9 formed at its inner end to conform to the groove I3 of the nut and to receive the balls therein, the inner end of the plug thus forming part of the raceway for the balls.

One 'side of the stem I8 is formed with a recess 20 adapted for receiving the inner end of a locking pin 2 I, inserted in a passage 22 extending parallel to the axis of the nut and having a threaded outer end 23 for securing the pin locking engagement in the nut.

The outer end of the spindle 5 is formed with a recess 24 in which a dowel pin 25 is adapted for engagement, the dowel pin projecting laterally from the inner end of the stem 8.

The plurality of circumferentially extending longitudinally spaced raceways I3 and I4 in the nut and spindle provide means for adjustingl the nut I2 longitudinally on the spindle, the nut being freely rotatable on the spindle by means of the balls I5 seated in said grooves or raceways.

After the balls I5 have been placed in position in the grooves or raceways and secured therein by the plug I'I and locking pin '2I, the stem 8 of the lead screw I is then inserted in the spindle with the dowel Din 25 seated in the recess 24 to prevent relative rotation thereof andthe nut I2 is then threaded on the threaded portion 5 of the lead screw.

The tapered stem 8 is thus drawn tightly in the tapered bore 6 of the spindle and the parts thus coupled firmly to each other.

The outer periphery of the nut I2 is preferably knurled, as indicated at 26, and also formed with recesses 21 for receiving a Spanner wrench and the lead screw 1 may also be formed with an opening 28 for receiving a pin or Spanner wrench to hold the lead screw while the nut is being tightened.

In view of the foregoing description, taken in conjunction with the accompanying drawing, it is believed that a clear understanding of the construction, operation and advantages of the de- 'vice will be quite apparent to those skilled in the art. A more detailed description thereof is accordingly deemed unnecessary.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and mawhat I male part having a threaded section, a nutIv adapted for engagement with said threadeol-apart.

said female part having an externaly annular groove and said nut having an internalannularf 20 Number groove and said nut having an internal annular groove adapted for registering with the groove of the female part, said nut having a. filler opening adapted for receiving balls for seating in said grooves for rotatably connecting the nut to the female part, a plug for said opening having a. concave recess in its inner end conforming to the groove of the nut in one position of the plug, said plug having a radial recess, and locking means in said? nutE for detaehabkvengaging; the radial recess tol retain`Y the concave recess "in alignment with the groove of the nut.


REFERENCES CITED The following references are of record in the ii'lefoi?r this: patent y UNITED STATES PATENTS Name Date Hogam Sept; ,22g/,1891 Vl 241,829? Y- Heap ;Auga8;1922 13143059: Browns rAugnZawa 1,962,739' f Hoegger .Juneslizglr FoREIGNfPATENTs" Lf Country Date,-` f Switzerland... ApnA lf, .1932


Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US459904 *Sep 13, 1890Sep 22, 1891TheCar-coupling
US1424820 *Jun 13, 1921Aug 8, 1922 Oil-well tool
US1774050 *Sep 30, 1926Aug 26, 1930New Britain Machine CoSprocket-center-removing means
US1962739 *Nov 16, 1932Jun 12, 1934Joseph A HoeggerFixture attachment
CH152019A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2826810 *Dec 11, 1956Mar 18, 1958Eastern Tool & Mfg CoConnector and method of forming the same
US4295752 *Jan 29, 1979Oct 20, 1981Vulcan Iron Works Inc.Retaining assembly
US4392633 *Oct 29, 1979Jul 12, 1983Winkle Denzal W VanValve structure having movable seat means
US7867099Feb 23, 2009Jan 11, 2011Neumayer Tekfor Holding GmbhConnecting arrangement between a shaft journal and a joint part
US8070614Aug 25, 2010Dec 6, 2011Neumayer Tekfor Holding GmbhConnecting arrangement between a shaft journal and a joint part
US20090208276 *Feb 23, 2009Aug 20, 2009Neumayer Tekfor Holding GmbhConnecting Arrangement Between a Shaft Journal and a Joint Part
US20110039627 *Aug 25, 2010Feb 17, 2011Neumayer Tekfor Holding GmbhConnecting Arrangement Between a Shaft Journal and a Joint Part
CN101529108BAug 17, 2007Apr 11, 2012诺伊曼尔泰克福尔控股有限公司Connecting arrangement
EP0373124A1 *Nov 22, 1989Jun 13, 1990BAKUER ITALIANA S.p.A.Joint for a modular tool carrier of a machine tool for machining metals or other materials
WO2008022625A1 *Aug 17, 2007Feb 28, 2008Neumayer Tekfor Holding GmbhConnecting arrangement between a shaft journal and a joint part
U.S. Classification403/317
International ClassificationB23B31/11, F16D1/02
Cooperative ClassificationB23B31/1107, B23B31/1122, F16D1/02, B23B2260/056
European ClassificationB23B31/11B4, B23B31/11B, F16D1/02